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排序方式: 共有58条查询结果,搜索用时 203 毫秒
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Vladimiro Cardenia Thaddao Waraho Maria Teresa Rodriguez-Estrada D. Julian McClements Eric A. Decker 《Journal of the American Oil Chemists' Society》2011,88(9):1409-1416
Phospholipids have been reported to inhibit lipid oxidation in bulk oils, but very little is known about their influence on
oxidation in oil-in-water emulsions. In the present study, the impact of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) on lipid oxidation was studied in 1% stripped soybean oil-in-water (O/W) emulsions as a function
of DOPC concentration and pH (3 and 7). At pH 7.0, DOPC inhibited lipid oxidation in O/W emulsions, while DOPC was prooxidative
at pH 3.0. DOPC did not affect emulsion droplet charge or size at either pH 3.0 or 7.0. The antioxidant activity at pH 7.0
was observed in a series of phospholipids (PL) that varied in fatty acid unsaturation level and chain length as well as type
of phosphate head group. Overall, phosphatidylcholine with either oleic or palmitic acid were the most effective at inhibiting
lipid hydroperoxide and hexanal formation of all of the PL tested. Antioxidant mechanism of PL could not be ascribed to their
ability to decompose lipid hydroperoxides. It might be possible that, at pH 7.0, the PL antioxidant activity is related to
their ability to form structures within the lipid phase of the emulsions droplets or to chelate metals. 相似文献
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非对称数字用户线路(ADSL)系统是目前部署的消费类DSL系统中最受欢迎的形式。它可在较短的环路中支持最大达12Mbps水平的数据速率。在环路延长至5.5Km或更长的情况下,通过调节其速率与频谱,仍可实现有意义的数据速率。但是,许多干扰降低了ADSL的覆盖范围,这就在网络中形成漏洞,无法实现可接受的服务速率。 相似文献
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Using a second generation enzyme immunoassay (ELISA) for the detection of antibodies against Hepatitis C virus (HCV), we investigated the frequency of antibodies anti-HCV and the Alanine Aminotransferase (ALT) plasma levels of 200 patients without history of viral hepatitis, liver diseases, blood transfusions, intravenous drugs abuse, homosexuality, hemodialysis, infection by Human Immunodeficiency Virus (HIV), Hepatitis B virus (HBV), nor workers of health services. There plasma samples (1.5%), were positives for antibodies anti-HCV, all of these samples were confirmed by RIBA (Recombinant Immunoblot Assay). In these three patients, the ALT plasma level were more than two folds the normal upper limit, another six patients had high ALT levels but less than one fold the normal upper limit. None of the infected patients had any clues that suggested the possible way of infection in the clinic history. We concluded that the incidence of Hepatitis C in the studied patients is 1.5% and that the ALT levels could be used to identify Hepatitis C infection. 相似文献
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Krukow K Nielsen M Sassone V 《Philosophical transactions. Series A, Mathematical, physical, and engineering sciences》2008,366(1881):3781-3793
We recapture some of the arguments for trust-based technologies in ubiquitous computing, followed by a brief survey of some of the models of trust that have been introduced in this respect. Based on this, we argue for the need of more formal and foundational trust models. 相似文献
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The coloured Petri net formalism has been recently used to analyse and optimise manufacturing systems making use of the state space (SS) analysis. This approach has great potential for scheduling and production planning purposes when it is properly implemented. In this article, an improved version of the algorithm known as the time line search for optimising the makespan of manufacturing models is presented. The algorithm has been developed for the use in a compact SS of coloured Petri net models in order to analyse the highest possible number of manufacturing configurations for the improvement of the makespan of a production system. The proposed algorithm can be used for the developing of decision support tools in manufacturing or operational decision-making. 相似文献
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We report a 30 years old woman with sporadic poliglandular autoimmune syndrome type II, first seen with an insulin-dependent diabetes mellitus and a Graves-Basedow disease that became spontaneously hypothyroid with positive antimicrosomal antibodies. Six years later she presented with persistent vomiting and a remarkable reduction in insulin requirements. She had low basal and stimulated-cortisol levels and the diagnosis of severe adrenal failure was reached. A CT scan showed normal adrenal glands, she did not have cutaneous hyperpigmentation nor evidences of mineralocorticoid deficit. A selective autoimmune damage of the fascicular zone was assumed but a selective damage of ACTH producing pituitary cells cannot be discarded. The importance of investigating adrenal function in cases of unexplained reduction of insulin requirements is emphasized. 相似文献
10.
Gold nanoparticles capped by peptides 总被引:1,自引:0,他引:1
Francesca Porta Giovanna Speranza
eljka Krpeti Vladimiro Dal Santo Pierangelo Francescato Giorgio Scarì 《Materials Science and Engineering: B》2007,140(3):187-194
Two dipeptides (GK and GC) and two 15-aminoacid peptides (GK15 and GC15) were used as capping agents in the preparation of monolayer-protected gold nanoparticles (MPCs). They were characterized by TEM microscopy, UV–vis, NMR and IR spectroscopy. 相似文献